Alexa built-in: With the Alexa app, you can listen to music, check the current traffic, create shopping lists, check the latest news, and more. The KDC-BT640U combines all new features and functions in one device. This includes the 3-way crossover, a 13-band equaliser with digital runtime correction and the latest Bluetooth technology. The hands-free kit in the KDC-BT640U supports the well-known functions for hands-free calling (HFP 1.7) and music streaming (A2DP) also the advanced music browsing profile AVRCP 1.6, which also supports wireless music streaming mode via A2DP. Concc; and targeted can be searched for individual music pieces on the mobile phone from the car radio. In addition, two phones can be paired in parallel with the car radio. Via the USB port, the KDC-BT640U delivers up to 1.5 A charging current and can thus charge compatible smartphones or power-hungry tablets particularly quickly. The integrated DSP offers a thirteen volume equaliser and a three-way active switch. The individual speakers can be adjusted both in level and running time to the respective installation position. In addition to loudness, "Stage EQ", "Drive EQ" and the "Sound Realizer" are also on board for special sound tuning. The setting of the many audio functions is particularly comfortable using the free Kenwood remote app. The Kenwood remote app makes compatible Android and Apple smartphones an extensive remote control for all Kenwood Bluetooth car radios. The app is controlled via large touch buttons or voice control for basic commands such as pause or title jump. The Kenwood Remote App is available for free in the Google Playstore and the App Store.